Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a data de fechamento de Hunterston B
 ###Tabelas: CREATE TABLE overall_results (overall_results_id AUTO_INCREMENT PRIMARY KEY, Position INT, Pilot VARCHAR, Country VARCHAR, Glider VARCHAR, Points INT) CREATE TABLE current_agr_reactors (current_agr_reactors_id AUTO_INCREMENT PRIMARY KEY, AGR Power Station VARCHAR, Net MWe INT, Construction started INT, Connected to grid INT, Commercial operation INT, Accounting closure date INT) CREATE TABLE eliminated_contestants'_weigh_in (eliminated_contestants'_weigh_in_id AUTO_INCREMENT PRIMARY KEY, Contestant VARCHAR, Starting Weight (kg) VARCHAR, Final Weight (kg) VARCHAR, Weight Lost (kg) VARCHAR, Percentage Lost VARCHAR, Position (out of Eliminated Contestants) VARCHAR) CREATE TABLE territorial_and_overseas_regions_recordholders (territorial_and_overseas_regions_recordholders_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Territory VARCHAR, Name VARCHAR, Birth date VARCHAR, Death date VARCHAR) CREATE TABLE national_intelligence_program_nip (national_intelligence_program_nip_id AUTO_INCREMENT PRIMARY KEY, Administrating agencies by NIP funds ONLY VARCHAR, Management and support INT, Data collection VARCHAR, Data processing and exploitation VARCHAR, Total INT)  
SELECT MIN Accounting closure date FROM current_agr_reactors WHERE AGR Power Station = Hunterston B